| 摘要 |
PROBLEM TO BE SOLVED: To provide a negative-pressure-type booster that can install a check valve by a simple process.SOLUTION: The negative-pressure-type booster has the check valve 7 including: a cylindrical part 71 formed integrally with one shell 11 and cylindrically projected toward inside of a housing 10 while being communicated to a connection pipe 6; and valve body parts 72, 8 disposed inside the cylindrical part 71 and axially fitted to the cylindrical part 71 inside the cylindrical part 71 so as to permit circulation of air from a negative-pressure chamber R1 to the connection pipe 6 and forbid circulation of air from the connection pipe 6 to the negative-pressure chamber R1.SELECTED DRAWING: Figure 4 |
